Using official statistics and a pooled dataset of longitudinal surveys, the aim of this article is to examine the impact of the Individual Visit Scheme (IVS) on political trust in Hong Kong. Our multilevel analysis found that the gradual inflow of IVS visitors (mostly overnight visitors) increased political trust in the first few years, but that this trust rapidly diminished in later years, especially after the introduction of the one-year multiple-entry IVS endorsement (which attracted mostly same-day visitors). The main reason for the reduction in the positive impact of the IVS scheme is that the growth in the number of same-day visitors has contributed less to Hong Kong's economy than has the increase in the number of overnight visitors, and has exacerbated several social problems. The impact of mainland visitors has varied across groups with different levels of education. The political trust of people with a senior secondary education has been enhanced more by the increase in overnight visitors and reduced less by the increase in same-day visitors than that of people with a tertiary level of education or a junior secondary education or below.